Michelle Williams hit the star-studded Critics' Choice Awards red carpet with best friend Busy Philipps on Sunday, but the Manchester by the Sea star revealed to ET that there’s one celebrity who recently left her starstruck: Diane Keaton.

"It is actually full of unexpected hilarity, there's moments in the movie that you can't believe it, you just find yourself laughing," Williams said of the Kenneth Lonergan-directed family drama. "It's so much like life, these sort of good and bad things happen in concert with each other."